LegendBreath Posted May 22, 2005 Report Share Posted May 22, 2005 Hi,What if I take a Vic-20 and change the CPU (6502) to a 6507 CPU? Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 22, 2005 Report Share Posted May 22, 2005 Hi LegendBreaththis takes me back a bit.. but according to websearchYes, they are identical. The 6507 package was created strictlyto save space on the PCB, in those days it did not make senseto create a new die and mask for such an "improvement" since thiswas much more expensive than the package design. The 6507 ina 2600 should react the same way to undocumented opcodes as the6502 in a C64.Does that help?Ed Quote Link to comment Share on other sites More sharing options...
LegendBreath Posted May 22, 2005 Author Report Share Posted May 22, 2005 Ok thanks, well do you know any "hacks" I could do on my Vic? (I'm boored :P) Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 22, 2005 Report Share Posted May 22, 2005 Hi LegendBreathI'm afraid my Vic has gently rusted out in the garage, maybe there's some way of recycling it as a doorstop, ah! technology moves on, in an odd sort of way I'd be happier playing with my Vic, PET, Dragon, Atari or Sinclair (Yes, i've still got them all) than Visual Studio .NET but I have to eatEd Quote Link to comment Share on other sites More sharing options...
LegendBreath Posted May 22, 2005 Author Report Share Posted May 22, 2005 Lol, yeah it's fun to play with old things :PAnd, someones know if it's possible that my CPU on my VIC-20 is a 6522??? Because, there is MOS 6522 and no 6502 chip on my board... Quote Link to comment Share on other sites More sharing options...
Bikerman Posted May 22, 2005 Report Share Posted May 22, 2005 The C64 is using a 6510 :POne of the best places (I think) for Commodore stuff is: http://www.funet.fi/pub/cbm/Miss my VIc-20 - it has alzhimers :'( - a known problem in old VIC's...But all my C64, spectrum, lambda, amiga, spectra video, sort, amstrad, new brain..... still works 8) Quote Link to comment Share on other sites More sharing options...
LegendBreath Posted May 23, 2005 Author Report Share Posted May 23, 2005 The C64 is using a 6510 :POne of the best places (I think) for Commodore stuff is: http://www.funet.fi/pub/cbm/Miss my VIc-20 - it has alzhimers :'( - a known problem in old VIC's...But all my C64, spectrum, lambda, amiga, spectra video, sort, amstrad, new brain..... still works 8)Well, do you know which chip the VIC-20 use? Quote Link to comment Share on other sites More sharing options...
Bikerman Posted May 23, 2005 Report Share Posted May 23, 2005 What chip ? - the CPU ? it is the 6502 Quote Link to comment Share on other sites More sharing options...
LegendBreath Posted May 24, 2005 Author Report Share Posted May 24, 2005 What chip ? - the CPU ? it is the 6502Yeah the CPU thanks Quote Link to comment Share on other sites More sharing options...
ante Posted May 25, 2005 Report Share Posted May 25, 2005 How about overclocking? 1 Mhz is standard if I remember correctly? Quote Link to comment Share on other sites More sharing options...
Bikerman Posted May 27, 2005 Report Share Posted May 27, 2005 Yes, well, 1.01 to be correct ;D Quote Link to comment Share on other sites More sharing options...
ante Posted May 28, 2005 Report Share Posted May 28, 2005 Hi Bikerman,I don’t have the schematics but I guess it would be possible to increase the heart rate a bit! 8)I once changed the 16 MHz X-tal to a 33 MHz on a 386 PC. ;D Quote Link to comment Share on other sites More sharing options...
Bikerman Posted May 28, 2005 Report Share Posted May 28, 2005 Here are the schematics http://www.funet.fi/pub/cbm/schematics/computers/vic20/index.htmlthere is a CPU running at 2 MHz you can out stright in (can't remember the name), you don't need to change the x-tal (6502DX2 ?? 8))when the VIC was hot you could buy a 4 MHz upgrade for it !!!, the problem with just changing the x-tal is your timing gets screwed, the timer and disk drive woun't work any more Quote Link to comment Share on other sites More sharing options...
Bikerman Posted May 28, 2005 Report Share Posted May 28, 2005 Just found that the 6502A runs at 2 MHz - but I don't know if it is with a 1 or 2 MHz x-tal Quote Link to comment Share on other sites More sharing options...
ante Posted May 30, 2005 Report Share Posted May 30, 2005 Hi Bikerman,OK, so no real time clock in a VIC then? With the PC there where no timing problems except with some old DOS programs. Quote Link to comment Share on other sites More sharing options...
Bikerman Posted June 1, 2005 Report Share Posted June 1, 2005 Hi Antenope no realtime clock Quote Link to comment Share on other sites More sharing options...
ante Posted June 2, 2005 Report Share Posted June 2, 2005 OK, not a god and simple “hack” then! ::) Quote Link to comment Share on other sites More sharing options...
Bikerman Posted June 5, 2005 Report Share Posted June 5, 2005 Nope, but it will probably give some "interesting" results :P Quote Link to comment Share on other sites More sharing options...
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